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研究了铝锂二元和五元合金的内耗。采用倒扭摆法,测定了不同热处理和时效状态的铝锂合金在升温和降温过程中的内耗和剪切模量。测量频率为0.3～5.0Hz。观测到了铝锂二元和五元合金中各自不同的内耗峰(即晶界内耗峰,Ke Peak)。实验表明,与纯铝和传统的铝合金相比,铝锂合金葛峰的峰高值比较低,并且对应葛峰的温度较低。根据晶界粘滞性滑动模型,上述实验结果可以归因于溶质原子Li及其沉淀相δ′(Al_3Li)和δ(AlLi)对晶界滑动的阻尼。本文对铝锂合金在不同热处理状态下的显微组织结构进行了透射电镜TEM观察。
The internal friction of Al-Li binary and five-element alloys was studied. The internal friction and the shear modulus of Al-Li alloys during heating and cooling were measured by inverse torsional pendulum method. The measurement frequency is 0.3 ~ 5.0Hz. The different internal friction peaks (ie, the peak-to-peak Ke Peak) of Al-Li binary and ternary alloys were observed. Experiments show that, compared with the pure aluminum and the traditional aluminum alloy, aluminum-lithium alloy Ge Feng peak height value is relatively low, and the corresponding Gefeng temperature is lower. According to the grain boundary sliding model, the above experimental results can be attributed to the damping of grain boundary sliding by solute atoms Li and their precipitates δ ’(Al_3Li) and δ (AlLi). In this paper, the microstructure of Al-Li alloy under different heat treatment conditions were observed by TEM.